NASA Tailplane Icing Video

If you’re wondering how the commuter airliner crash near Buffalo occurred, this NASA video on tailplane icing may be helpful. A bit of background… An airplane’s wings pull the airplane up into the sky. The center of gravity is in front of the wing. For stability, the tail surfaces push down (See figure 4-20 within the Pilot’s Handbook of Aeronautical Knowledge (FAA)). If the tail were to stop pushing down, the nose would pitch down uncontrollably. The video explains how extending flaps increases the angle of attack on the tail and, given ice accretion on the tail, that angle may be a stalling angle.

Some highlights… 11:00 they show how they attach simulated styrofoam ice to the tail; 13:00 they tell you not to try this at home; 15:50 unexpected tailplane stall, corrected by retracting flaps.

Full post, including comments

Eliminating grade levels in public schools

One of my flight instructors had been a high school English teacher. “Scott, how could you quit an $80,000/year union job to become an $8/hour flight instructor?” I asked. He explained that it was too painful to watch students being failed by the system of locking a class together for an entire school year. “A student falls behind a little bit in French I. Now the lectures are over his head so he gets a C for the year. The next year he is promoted to French II. Everything is way over his head, so his time in the class is a complete waste and he gets an F.” How should it have been organized? He thought that students should be reevaluated and reshuffled every 4-8 weeks, as they are at many adult language schools, so that a student was always in a class appropriate to his or her level.

Now it appears that one school district in Colorado has adopted his idea… story.

Full post, including comments

American Securitization Forum

[If registering for ASF 2010, you may want to avoid using a credit card. A registration clerk, employed by American Securitization, quoted me a total fee of $35, which I agreed to. Two and a half months after the conference, the company added an additional unauthorized $2495 charge to the same credit card.]

Every year the folks who made our modern world of finance gather in Las Vegas for the American Securitization Forum. Banks that made loans in the good old days held onto the loans. An officer of the bank would look a neighbor in the eye across a table and ask “Bill, how are you going to repay this [house, car, business] loan?” If they guessed wrong about their neighbors, the bank would go bust. There was a lot of friction in applying capital from distant locations. The bank would have to prove its soundness to a wealthy company or individual in another city and borrow some money, which it could then lend out to local customers.

Starting about 25 years ago, banks began to package up and sell their mortgages, car loans, credit card loans as securities, which could be bought and sold in global markets like other stocks and bonds. The investors in these securities relied on rating agencies, such as Moody’s and Standard and Poor’s, and the integrity of the originating banks, to judge the credit risk. Once this system was in place almost anyone could issue a loan. Two guys with no capital could start selling mortgages. A car dealer could issue car loans. A startup company could issue credit cards. Investors from Saudi Arabia and China could be financing houses in the U.S. just weeks after the loans had been made.

The system broke down starting in 2007. The rating agencies had been paid by the issuers and assigned ridiculously optimistic ratings to crummy loans. Guys in Germany ended up owning home loans in Cleveland where the new homeowners had never had a job, never made a single mortgage payment, wouldn’t answer the phone, wouldn’t reply to mail, and wouldn’t answer the door.

The American Securitization Forum is where the investment banks, rating agencies, bond salespeople, risk analysts, lawyers, and, most importantly, investors, meet.

A friend who attended the conference a year ago said “Last year these guys were predicting Armageddon. I guess they were right, so we should probably listen to what they have to say this year.”

Here’s a sampling of what I heard…

Sandra Thompson, a top official at the Federal Deposit Insurance Corporation, talked about her goal of preventing foreclosures by rewriting home mortgages. Payments could be cut by 20 percent and a lot of people would be able to stay in their homes. She expected a 40 percent re-default rate. An audience member greeted her plan with derision. “Have you driven around neighborhoods right here in Las Vegas? Half of the houses are empty. The ones that are occupied have six cars parked out front and you can smell the meth cooking. Do you think that the meth guys are going to answer the phone and start making payments if you cut their mortgage by 20 percent?”

Scott Polakoff, from the Office of Thrift Supervision, said “what we need to do is reduce unemployment and raise housing prices.”

James Lockhart, the regulator of federally issued mortgages and Fannie/Ginnie/Freddie, noted that 35 percent of the mortgage market is now FHA/VA, i.e., money that is lent out directly by and owed back to the federal government. This is up from a historical level closer to 10 percent. He related his involvement in an attempt by the Bush Administration several years ago to prevent Fannie and Freddie from exploiting their lower cost of borrowing to take on a lot more risk and rack up enormous paper profits (and therefore executive bonuses). Lobbying by Fannie and Freddie in Congress prevented the government-sponsored entities from becoming subject to additional regulation and they blew up in the fall of 2008. Lockhart waxed enthusiastic about private money coming back into the mortgage market. A audience member noted that the government asked private money to invest in Fannie Mae in September 2008. Tens of millions was duly invested in preferred stock. The agency was nationalized a few weeks later and the new investment was wiped out. “What guarantees do we have that future private investors won’t be treated so shabbily by the government?” Lockhart mumbled that a lot had happened since September 2008, including the failure of Lehman.

Mary Kane, an executive of Citigroup, made the most confidence-inspiring comments. She noted that consumer spending was 2/3rds of the economy. The consumer savings rate was near zero percent of income. Now it is trending up towards 7 percent of income. That alone would be enough to shrink the economy. She noted that consumers had lost $7 trillion in paper value on their houses and stock investments. That’s equal to an entire year of national income.

Ralph Daloisio cast scorn on the government’s new TALF program. The $200 billion being lent isn’t enough to move the $11 trillion asset-backed securities market. The program applies only to new loans and securities. “Why would people buy this new stuff anyway when they can get a 20 percent return on existing mortgage-backed bonds, even in the worst-case scenario?” [A money manager sitting next to me noted that the worst-case scenario is that houses go to zero.]

Attendees were surveyed as to the date when the market would “return to normal”. “Never” was a reasonably popular answer, but 2011 was the most common. People expected the U.S. economy to continue to decline through 2009 and start to pick up in 2010.

Nobody proposed changing the way that bonds are rated. Moody’s and Standard and Poor’s get paid by bond issuers to assign risk ratings (see this video for an explanation). Nobody suggested ending this conflict of interest.

For most of the government officials and many of the market participants, the goal seemed to be to turn back the clock by 5 years. Everyone was happy then and making good money. Most Americans had jobs and house prices kept going up.

Las Vegas town report: The city is littered with partially finished real estate development. A 4000-room hotel/casino on the strip has 90 percent of its windows in place, a steel skeleton poking above, and very little apparent construction activity. A new shopping mall near Summerlin is a steel shell with nobody working. Tract housing has come to a halt. Hotels and restaurants are about 70 percent of the usual volume and taxi drivers report that business is slow. Valley of Fire State Park is a beautiful place to drive around and take some short walks with a camera. I learned that a great way to get rid of an unwanted spouse is to pick up Hiking Las Vegas: 60 Hikes Within 60 Minutes of the Strip and try out the “Turtlehead Jr.” hike/scramble in Red Rock Canyon. If your companion does not slip and fall 100′, a slight push should suffice.

Full post, including comments

U.S. Financial Market Regulation

One of the things that struck me at the American Securitization Forum was the sheer number of governmental entities that regulate U.S. banks and financial markets. The conference featured speakers from the following agencies:

  • United States Treasury
  • Federal Reserve Board of Governors (sets interest rates and other policies)
  • the 12 individual Federal Reserve Banks (regulate some banks)
  • Securities and Exchange Commission (ignores complaints about guys like Madoff, approved Enron’s mark-to-market accounting scheme back in the mid-1990s)
  • Office of Thrift Supervision (savings and loan regulation?)
  • Office of the Comptroller of the Currency (part of Treasury)
  • Federal Housing Finance Agency (regulates Fannie Mae, Ginnie Mae, FHA, VA housing)
  • Federal Deposit Insurance Corporation (has started to insure hundreds of billions of dollars in interbank loans, TLGP)

Each of these agencies has some power to compel a bank to maintain a certain capital reserve or a financial institution to make or deny certain loans.

The patchwork of regulation historically has created the problem of shopping by banks. If a bank didn’t like how it was being regulated by the Fed, it could switch its charter and be regulated by one of the 50 states. In the current environment the patchwork makes the enormous changes being contemplated rather risky. The agencies may be acting at cross-purposes and it is impractical for all of the agencies to review a proposed new regulation. Simply making all of these decision-makers aware of what is going on would require years of meetings and conference calls.

Full post, including comments

The Audacity of Doing Nothing

I spent a few days recently in the company of some money managers with a total of about $2 trillion to invest, precisely the sort of folks whose confidence the government is currently trying to win. How did they feel about all of the rule and policy changes coming out of Washington and the new more muscular government? Terrified.

The “real money” investors didn’t want to invest alongside the government. Their concern is that if things go south, the government will take 100% of the value left in the bank or whatever and leave private investors, including recent ones, with nothing. This is precisely what happened to recent investors in Fannie Mae.

The “real money” investors didn’t want to see judges modifying contracts, e.g., bankruptcy judges resetting mortgage payments at a lower level and reducing the principal owed. As far as they were concerned, a central tenet of the U.S. Constitution is that people are free to make contracts. Given how mortgages are split up among investors, a foreclosure is greatly preferable to these folks than a modification. In a foreclosure the most senior investors get what they expected, i.e., their money back. The holders of the most junior tranches, which carried a higher return and were known to be high risk, would get nothing. This is also what they would have expected. If mortgages are modified by government action, however, it is unclear how the obligations among the various private parties should be adjusted.

“What’s wrong with foreclosures?” some of these folks asked. “The historical rate of home ownership is about 60 percent and we’re probably going to revert to that sooner or later so why slow things down? How does it help the U.S. to have high housing prices? Isn’t it better for housing to be affordable? If we give a lot of money to people to prevent foreclosures in March, how is that fair people who were foreclosed on in January?”

Much of the justification for government intervention comes from the assertion that markets have failed. One money manager scoffed at this idea. “The markets are working fine, but they’re giving people answers that they don’t like, so people cry market failure.” Stocks and bonds low? That’s because investors are afraid of a prolonged depression and continued government interference. House in a jobless region of Michigan worth almost nothing? A place with 50% of its former jobs only needs 50% of its houses. There are plenty of former steel towns where the price of a comfortable house stabilized at $20,000 decades ago and has barely moved since.

What did these guys want the government to do? Nothing, basically. “Back in the 19th Century, there were a lot of steep crashes, guys got wiped out, and the economy came back quickly.” What’s different now? The government is a lot bigger and more powerful. Rich companies and people can put some of their wealth into lobbying and demand that the government prevent them from getting wiped out (or at least slow the process).

Barack Obama promised on Monday not to rest as long as this economic downturn persisted. He promised to act decisively, change whatever had to be changed, spend whatever had to be spent. This is precisely what worries the investors to whom I spoke. They’d rather see the audacity of doing nothing.

Full post, including comments

Chagall: A Biography

I just finished Chagall: A Biography. The book is well-written, moderately generous with color plates, and reasonably timely. Timely? How can a book about a guy who lived from 1887 to 1985 be timely? As our country goes through an economic upheaval, it is interesting to refresh one’s memory with the upheavals that faced nearly all European and Russian Jews during the 20th Century. Chagall endured the challenges occasioned by the Russian Revolution, including a significant rise in Jew-hatred. Chagall endured the hyperinflation of Weimar Germany. He escaped the German occupation of Paris by fleeing to the south of France. Chagall, thanks mostly to his fame and talent, managed to get rescued from the French-German round-up of Jews in Vichy France and escape to the U.S. He endured not knowing whether or not his daughter was alive. Chagall endured the death of his wife Bella from strep throat, which would have been easily prevented if not for a wartime shortage of drugs. Chagall endured four years living in the U.S. without learning more than a few words of English.

This biography makes the events of history curiously more vivid by showing their effects on just one individual.

Full post, including comments

Alabama Ironworkers Explain Stimulus Bill

While eating breakfast in the Las Vegas airport this morning, I met three ironworkers from Tuscaloosa, Alabama. They said that work had been slow lately. Did they expect the stimulus bill going through Congress to help them out? Would $1 trillion in new government spending lead to more construction jobs? “That’s just blowing money up a wild hog‘s ass.”

Full post, including comments

Why do we track the race of students taking standardized tests?

Yesterday’s New York Times article has an article entitled “Blacks Less Likely to Take A.P. Exam.” The article has two points. Blacks are less likely than other high school graduates to take the Advanced Placement tests. Blacks who take the test are much less likely to pass than non-black students (8 percent of those taking the exams checked the “I am black” box; only 4 percent of those passing the exams had checked the “I am black” box).

Does the utility of this information justify its collection? We’re not willing to do anything drastic to change the way that our schools are run. We will still have unionized teachers, teachers who jobs are guaranteed (tenured) after a few years, and all but the richest kids forced to attend their local public school. If schools are failing black students, we’re apparently more comfortable with that than we are in confronting the teachers and administrators who benefit from the status quo.

Medical doctors say that “Never order a test unless you know what you’re going to do with the result.” What are we going to do with this result? Fire teachers if most of their students fail the A.P. exam? That would violate the union contract and we’re not going to do it. Increase the budget for schools with a lot of black students? Many of these schools already spend close to $25,000 per student per year (much of that is spent on administration rather than classroom instruction). Absent an economic miracle there is no way that taxes or debt can be increased to enable an increase beyond 25,000 current dollars per student annually.

Let’s consider the negative aspects of collecting these data. A student walks into the testing room. She thinks that she is going to be judged on the accuracy of her answers. The first question that she faces, however, is “What is your race?” The second will be “Are you male or female?”

Unless we’re going to guarantee today’s 17-year-olds that they will enjoy a lifetime of race-based university admissions, public and private employer hiring, and government contracting, why introduce them to the idea that the color of their skin is going to be the primary thing that matters to other people?

Another negative to collecting and publishing these data is the effect on employers and people involved in college admissions. The simplest one-line summary for the New York Times article would be “blacks are not as smart or well educated as people of other races” (it might have been written by William Shockley!). That’s probably what the average reader will remember in his or her subconscious for the next few weeks. The black guy who goes looking for a job today will definitely not be helped if the person interviewing him has read yesterday’s Times. If his interviewer has a Ph.D. in Statistics, perhaps the interview will go okay as the interviewer can recognize that an individual sample may fall anywhere within a probability distribution. But for most of us the last thing that we need are unconscious racial biases introduced by non-profit organizations (the College Board) and the media (the Times).

Full post, including comments

Collaborative Decision-Making Software?

Consider a university teacher. She wants to hold a class in which the students work together to solve a problem. To make the example concrete, suppose it is an economics class in which the students have to come up with a $1 trillion stimulus plan for the U.S. Or suppose it is an engineering class in which the students have to come up with a design for an exercise machine that can function as a first-person shooter videogame controller (my personal favorite solution to America’s obesity problem).

During the class, the best student ideas will need to be highlighted and expanded upon. The unworkable ideas will need to be pushed into the background so that they don’t clutter the discussion. If you ask Jane Professor how many students she can accommodate in an “active problem-solving seminar”, she would probably say no more than 15. Why so few? Jane is going to have to be the one to direct the discussion, suppress truly bad ideas (like my personal economic recovery plan!), highlight the best ideas, and summarize some of the results.

The students should enjoy a course like this because their efforts might in fact be productive. Perhaps the engineering course is sponsored by a company that can produce the product if the design is good enough. The students should also learn more from this course than from a standard “here’s some knowledge handed down from on high” because they have to be active thinkers. We’re so enthusiastic about this method of learning that we tell Jane Professor we’re giving her 100 students intead of 15. What does she do? Go back to the traditional lecture and homework format. She can’t moderate a discussion among 100 students. Even if she were to run a standard Web-based discussion forum system for the 100 students it would be too much work to moderate. The loudmouths and first answers would dominate, not the best answers.

Two questions then, for the assembled readers…

  1. would it be practical to use software to assist a group of 100 students develop a solution to a problem?
  2. if so, how much of this software already exists?

At a minimum, the software would need to provide distributed features to allow some ideas to be flagged as more important. Perhaps the authors of those ideas would thereby earn some “karma points” (slashdot style) that would enable them to moderate up or down other ideas.

One big area where I think traditional discussion forum software falls short is that there is a strong presumption in a discussion forum software that the most recently posted content is more important than older stuff. If the challenge for the semester is a complete solution to a design problem, every part of the solution is equally important, whether that solution was developed early in the semester or later. Also, we need something that lets a group of people collaboratively develop a hierarchy.

Wikipedia seems like an example of a collaboratively developed solution to the problem of “how do you write an encyclopedia”. There isn’t very much identification of content with authors, however, and it becomes tough to know who should get credit for various pieces of the solution (in a university course, you need to make sure that each student is doing something!).

Full post, including comments

High definition video on YouTube

My friend John and I want to make some instructional videos for streaming from within my “how to fly” Web pages. A first attempt is available on YouTube: “Briefing an Instrument Approach.” I have a few questions about the quality of this video for those of you with powerful PCs. On my Dell XPS from 2006 (two CPUs), the video is slightly choppy and the audio seems out of sync of the video. The video was captured with a 3-CCD Sony HDV camera in 1080i (state of the art in 2006!) and exported to 720p with Adobe Premiere Pro CS4. The audio was captured at 48 KHz but converted to 44.1 KHz for the export, which is the default behavior when you say “YouTube HD” to Premiere. We used a Westcott daylight-balanced fluorescent Spider Light TD5 and soft boxes for lighting.

So.. for those of you with modern quad-core PCs… how does the video look? Do I have Parkinson’s?

My second question is whether YouTube is the right service to use. I don’t want to pay for the bandwidth to stream these videos. At the same time, I don’t want the videos to be interrupted with a lot of ads. Even worse, it would be bad if competitive flight schools ran ads inside these videos. Aside from the satisfaction of helping others learn, it would be nice if we got a few new students at East Coast Aero Club. Nor would we want other flight schools to embed these videos in their own sites, chop off the opening and closing titles (with our URL), and use them to promote their own operation. (I recognize that it is unrealistic to ask someone else to pay for all of the streaming infrastructure and not eventually stick ads in the videos.)

My third question is what do video nerds think about the overall quality of production? Should we give up before we embarrass ourselves further?

My final question for video experts comes from my friend Ken. What consumer-grade HD camcorder should he buy to make videos of his kids? Was there anything interesting announced at CES? I think his budget would stretch to $1000 but it would obviously be better to bring this in for closer to $500. And what’s the deal with hard drive camcorders with 80 GB drives? Aren’t there 64 GB flash cards now?

Full post, including comments